I love zoo shooting (see my pix elsewhere). One suggestion I would make is to try your best to avoid the 'animal in a cage' look. I think that getting images of a cage degrades an otherwise excellent image (e.g. your #11). Obviously this can be very difficult and I find it one of the most frustrating things when I go to the zoo. Birds, especially, seem to be the ones that have the worst lighting and cage-interference. Of your images, I like your Komodo best.